Common dash warning lights in the Mercedes A Class are check engine/EPC, abs, traction, srs airbag, DPF & service messages, but the full list of warning lights is shown below.
If you prefer a multi manufacturer OBD2 scan tool tool that works on this Mercedes A Class W177 & other makes & models, we highly recommend this iCarsoft CR PRO +
Mercedes A Class W177 Check Engine Warning Light Meaning
The check engine warning lamp illuminates when the ignition is switched on & turns off when the engine starts.
If the engine lamp illuminates when the engine is running, a fault has been detected & you should get the fault diagnosed as soon as possible. Watch our video on why your Mercedes Check Engine Light Is Illuminated.
With the lamp illuminated, the vehicle may enter limp-home mode. Limp-home mode reduces vehicle performance to safeguard against any further damage to the vehicle.
Watch our video on the most common reasons for a Mercedes Check Engine Light
To diagnose/reset this check engine light, and remove the vehicle from Limp-home mode, we recommend the iCarsoft MB V1.0. With this tool, you can also view lots of live data like temperatures, pressures from all areas of the engine and transmssion system.
The tool is in stock with same day dispatch & worldwide delivery.
Mercedes A Class W177 SRS Airbag Warning Light Meaning
The airbag warning lamp illuminates, as a bulb check, when the vehicle's ignition is switched on & will turn off when the engine is started.
Watch our video on the most common reasons for a Mercedes SRS Airbag Light
If the lamp illuminates again while driving, there is a fault with the airbag system. You can diagnose & reset the airbag fault codes & warning light with the iCarsoft MB V1.0.
The tool is in stock with same day dispatch & worldwide delivery.
Mercedes A Class W177 ABS/ESP/EBV Warning Light Meaning
The ABS warning lamp illuminates briefly, as a bulb check, when the vehicle's ignition is switched on & will turn off when the engine has started.
If the lamp remains on while driving there is a fault with the ABS system. You may also get messages like ESP, ABS, EBV on the message centre of the dashboard.
Watch our video on the most common reasons for a Mercedes ABS ESP EBV warning Light
You can diagnose faults in the ABS system with the iCarsoft MB V1.0.
The tool is in stock with same day dispatch & worldwide delivery.
Mercedes A Class W177 Traction Control Warning Light Meaning
The ESP Electronic Stability Control warning lamp flashes when the system is active.
If there is a fault with the system, it remains illuminated and the instrument panel displays a warning message.
To diagnose a fault in the ESP system, we recommend the iCarsoft MB V1.0.
The tool is in stock with same day dispatch & worldwide delivery.
Mercedes A Class W177 Glowplug Coil Warning Light Meaning
The glow plug lamp illuminates when the vehicle's ignition is switched on, to indicate that the glow plugs are active.
If the lamp remains on while driving there is a fault with the glowplug system. To diagnose this fault you can use the iCarsoft MB V1.0
The tool is in stock with same day dispatch & worldwide delivery.
Mercedes A Class W177 DPF Warning Light Meaning
The Diesel Particulate Filter (DPF) warning lamp illuminates when the DPF is full, or there is a fault with the DPF system.
To view live DPF data, read/clear DPF fault codes, and carry out a DPF regeneration we recommend the iCarsoft MB V3.0
The tool is in stock with same day dispatch and worldwide delivery.
Mercedes A Class W177 EPB Electronic Parking Brake System Warning Light Meaning
The Electric Parking Brake (EPB) warning lamp illuminates if the EPB is correctly applied.
If the lamp illuminates during normal driving conditions, a fault has been detected. To find faults in this system, or calibrate the EPB electronic parking brake, open & close the calipers for brake bad removal/refitting we recommend the iCarsoft MB V3.0.
The tool is in stock with same day dispatch & worldwide delivery.
Mercedes A Class W177 Brake Exclamation Warning Light Meaning
The brake warning lamp illuminates briefly, as a bulb check, when the vehicle's ignition is switched on.
If the lamp illuminates red while driving, suspect low brake fluid level or a fault with the ABS braking system.
To diagnose a fault in the braking system of your Mercedes, we recommend the iCarsoft MB V1.0.
The tool is in stock with same day dispatch and worldwide delivery.
Mercedes A Class W177 TPMS Tyre Pressure Warning Light Meaning
The Tyre Pressure Monitoring System (TPMS) lamp illuminates yellow to warn that one or more tyres are significantly under-inflated.
Stop the vehicle as soon as possible, when safe to do so. Check the tyre pressures. Inflate to the recommended pressure.
The lamp flashes to indicate a system fault. To diagnose a TPMS fault, we recommend the iCarsoft MB V3.0.
The tool is in stock with same day dispatch & worldwide delivery.
Mercedes A Class W177 Oil Can Warning Light Meaning
If the low oil pressure warning lamp flashes or illuminates while driving, stop the vehicle as soon as safety permits. Switch off the engine immediately.
Check and top up the oil level, if necessary. Start the engine. If the lamp remains illuminated, switch the engine off immediately. You can diagnose this fault with the iCarsoft MB V1.0.
The tool is in stock with same day dispatch & worldwide delivery.
Mercedes A Class W177 Cooling System Warning Light Meaning
The engine temperature warning lamp illuminates when the engine's temperature is too high.
The instrument panel also displays a warning message.
Stop the vehicle as soon as safety permits. You can check engine & transmission temperatures & diagnose faults with the iCarsoft MB V1.0.
The tool is in stock with same day dispatch & worldwide delivery.
Mercedes A Class W177 Battery System Warning Light Meaning
The 12V battery charge warning lamp illuminates, as a bulb check, when the vehicle's ignition is switched on.
The lamp extinguishes when the engine is started.
If the lamp remains on or illuminates while driving, there is a fault with the battery charging system. The instrument panel displays a warning message.
Mercedes A Class W177 DPF Regeneration Tool
In some cases, your A Class W177 may not have been driven for long enough periods of time to carry out a DPF regeneration. Because of this, there is an option to carry out a DPF regenration using a specialist OBD2 tool.
If you need to carry out a DPF regeneration you can do that by using the iCarsoft MB V3.0
The tool is in stock with same day dispatch & worldwide delivery.
With this tool, you can also view live DPF data, like soot content, distance since last regeneration & more.
If you require clarification that this tool can carry out this specific function on your vehicle, please email your vehicle VIN number and model year to enquiries@diagnostic-world.com
Mercedes A Class W177 Oil Service Due and Overdue Message Reset Tool
There is a specific service schedule for your W177 A Class. When the oil 5service or inspection needs to be carried out, you will see this message (or similar) when starting the vehicle, and also turning off the vehicle.
Service Overdue by XX Days
Service Due in XX Days
You can reset this message FOR FREE WITHOUT A SCAN TOOL.
Watch this video on how to reset service due/service overdue message on a Mercedes A Class W177
Mercedes A Class W177 ADBLUE/DEF Reset
You may encounter a message on your dashboard which looks like one of the following
- Adblue Eng. start not possible in XXX miles
- Adblue Cannot measure fluid level
- Check Adblue
You can reset this message with the iCarsoft MB V3.0
The tool is in stock with same day dispatch & worldwide delivery.
Mercedes A Class W177 Injector Coding Tool
You can code new injectors to your Mercedes A Class W177 by using the iCarsoft MB V3.0
The tool is in stock with same day dispatch & worldwide delivery.
If you require clarification that this tool can carry out this specific function on your vehicle, please email your vehicle VIN number and model year to enquiries@diagnostic-world.com
Mercedes A Class W177 Electronic Throttle Calibration Tool
You can calibrate the Electronic Throttle system (ETC) on your A Class W177 by using the iCarsoft MB V3.0
The tool is in stock with same day dispatch & worldwide delivery.
Mercedes A Class W177 NOx Sensor Calibration & Reset Tool
If you have a fault with your NOx sensor and needs to be replaced, you need to use a special diagnostic tool that can code the new part to the vehicle.
You can do this teach in process with the iCarsoft MB V3.0
Mercedes A Class W177 Air Suspension Calibration & Reset
You can calibrate the air suspension system in your A Class W177 by using the iCarsoft MB V3.0
The tool is in stock with same day dispatch & worldwide delivery.
If you require clarification that this tool can carry out this specific function on your vehicle, please email your vehicle VIN number and model year to enquiries@diagnostic-world.com
Mercedes A Class W177 Electronic Parking Brake EPB Tool
You can open & close the brake calipers, and calibrate the Electronic parking brake system (EPB) on your A Class W177 by using the iCarsoft MB V3.0
The tool is in stock with same day dispatch & worldwide delivery.
If you require clarification that this tool can carry out this specific function on your vehicle, please email your vehicle VIN number and model year to enquiries@diagnostic-world.com
Mercedes A Class W177 Steering Angle Sensor Calibration Tool
You can calibrate the steering angle sensor system in your A Class W177 by using the iCarsoft MB V3.0
The tool is in stock with same day dispatch & worldwide delivery.
1. Does that tool have the capability for the system/warning light you are trying to reset? So for example, lets say you have an ABS warning light on your dashbaord. You need to make sure you are buying a scan tool that has ABS capabilities and will actually allow you to communicate with the ABS system.
2. Assuming you do have the correct scan tool for the job, the next thing to look at is why the tool isnt turning off the warning light. When you attempt to reset the fault codes using the scan tool, it is communicating with the ECU, and asking the ECU to turn the light off.
If the light does not turn off, it means that the ECU has refused the request, and that it is not happy that the problem has been fixed. In other words the problem is still present, and if you think you have physically fixed the issue, you might need to go over everything again, checking connections, wiring etc.
It can be a misconception that these tools are a kind of magic pill, and that the tool can just reset a warning light without taking any action to fix the fault. This is not correct, in 99% of cases, you need to physically fix the fautl before the warning light in your Mercedes A Class can be turned off. The rare situations where the warning light will turn off without any physical fix is where a sporadic or intermittant fault has occured.
